<script>
import { chooseFile } from './utils'
import mixin_accept from './mixin.js'
import props from './props.js'

// import { array, func, image, promise, video } from '@/uni_modules/uv-ui-tools/libs/function/test.js'
// import mpMixin from '@/uni_modules/uv-ui-tools/libs/mixin/mpMixin.js'
// import mixin from '@/uni_modules/uv-ui-tools/libs/mixin/mixin.js'

/**
  * upload 上传
  * @description 该组件用于上传图片场景
  * @tutorial https://www.uvui.cn/components/upload.html
  * @property {String}   accept    接受的文件类型, 可选值为all media image file video （默认 'image' ）
  * @property {String | Array} capture    图片或视频拾取模式，当accept为image类型时设置capture可选额外camera可以直接调起摄像头（默认 ['album', 'camera'] ）
  * @property {Boolean}   compressed   当accept为video时生效，是否压缩视频，默认为true（默认 true ）
  * @property {String}   camera    当accept为video时生效，可选值为back或front（默认 'back' ）
  * @property {Number}   maxDuration   当accept为video时生效，拍摄视频最长拍摄时间，单位秒（默认 60 ）
  * @property {String}   uploadIcon   上传区域的图标，只能内置图标（默认 'camera-fill' ）
  * @property {String}   uploadIconColor  上传区域的图标的字体颜色，只能内置图标（默认 #D3D4D6 ）
  * @property {Boolean}   useBeforeRead  是否开启文件读取前事件（默认 false ）
  * @property {Boolean}   previewFullImage 是否开启图片预览功能（默认 true ）
  * @property {Boolean}   previewFullVideo 是否开启视频预览功能（默认 true ）
  * @property {String | Number} maxCount   最大上传数量（默认 52 ）
  * @property {Boolean}   disabled   是否启用（默认 false ）
  * @property {String}   imageMode   预览上传的图片时的裁剪模式，和image组件mode属性一致（默认 'aspectFill' ）
  * @property {String}   name    标识符，可以在回调函数的第二项参数中获取
  * @property {Array}   sizeType   所选的图片的尺寸, 可选值为original compressed（默认 ['original', 'compressed'] ）
  * @property {Boolean}   multiple   是否开启图片多选，部分安卓机型不支持 （默认 false ）
  * @property {Boolean}   deletable   是否展示删除按钮（默认 true ）
  * @property {String | Number} maxSize    文件大小限制，单位为byte （默认 Number.MAX_VALUE ）
  * @property {Array}   fileList   显示已上传的文件列表
  * @property {String}   uploadText   上传区域的提示文字
  * @property {String | Number} width    内部预览图片区域和选择图片按钮的区域宽度（默认 80 ）
  * @property {String | Number} height    内部预览图片区域和选择图片按钮的区域高度（默认 80 ）
  * @property {Object}   customStyle   组件的样式，对象形式
  * @event {Function} afterRead  读取后的处理函数
  * @event {Function} beforeRead  读取前的处理函数
  * @event {Function} oversize  文件超出大小限制
  * @event {Function} clickPreview 点击预览时触发
  * @event {Function} delete   删除图片
  * @example <uv-upload :action="action" :fileList="fileList" ></uv-upload>
  */
export default {
  name: 'UvUpload',
  // #endif
  mixins: [mpMixin, mixin, mixin_accept, props],
  // #ifdef VUE3
  emits: ['error', 'beforeRead', 'oversize', 'afterRead', 'delete', 'clickPreview'],
  data() {
    return {
      // #ifdef APP-NVUE
      successIcon: '',
      // #endif
      lists: [],
      isInCount: true,
    }
  },
  watch: {
    // 监听文件列表的变化，重新整理内部数据
    fileList: {
      deep: true,
      immediate: true,
      handler() {
        this.formatFileList()
      },
    },
  },
  methods: {
    formatFileList() {
      const {
        fileList = [], maxCount,
      } = this
      const lists = fileList.map(item =>
        Object.assign(Object.assign({}, item), {
          // 如果item.url为本地选择的blob文件的话，无法判断其为video还是image，此处优先通过accept做判断处理
          isImage: this.accept === 'image' || image(item.url || item.thumb),
          isVideo: this.accept === 'video' || video(item.url || item.thumb),
          deletable: typeof (item.deletable) === 'boolean' ? item.deletable : this.deletable,
        }),
      )
      this.lists = lists
      this.isInCount = lists.length < maxCount
    },
    chooseFile() {
      this.timer && clearTimeout(this.timer)
      this.timer = setTimeout(() => {
        const {
          maxCount,
          multiple,
          lists,
          disabled,
        } = this
        if (disabled)
          return
        // 如果用户传入的是字符串，需要格式化成数组
        let capture
        try {
          capture = array(this.capture) ? this.capture : this.capture.split(',')
        }
        catch (e) {
          capture = []
        }
        chooseFile(
          Object.assign({
            accept: this.accept,
            multiple: this.multiple,
            capture,
            compressed: this.compressed,
            maxDuration: this.maxDuration,
            sizeType: this.sizeType,
            camera: this.camera,
          }, {
            maxCount: maxCount - lists.length,
          }),
        )
          .then((res) => {
            this.onBeforeRead(multiple ? res : res[0])
          })
          .catch((error) => {
            this.$emit('error', error)
          })
      }, 100)
    },
    // 文件读取之前
    onBeforeRead(file) {
      const {
        beforeRead,
        useBeforeRead,
      } = this
      let res = true
      // beforeRead是否为一个方法
      if (func(beforeRead)) {
        // 如果用户定义了此方法，则去执行此方法，并传入读取的文件回调
        res = beforeRead(file, this.getDetail())
      }
      if (useBeforeRead) {
        res = new Promise((resolve, reject) => {
          this.$emit(
            'beforeRead',
            Object.assign(Object.assign({
              file,
            }, this.getDetail()), {
              callback: (ok) => {
                ok ? resolve() : reject()
              },
            }),
          )
        })
      }
      if (!res)
        return

      if (promise(res))
        res.then(data => this.onAfterRead(data || file))
      else
        this.onAfterRead(file)
    },
    getDetail(index) {
      return {
        name: this.name,
        index: index == null ? this.fileList.length : index,
      }
    },
    onAfterRead(file) {
      const {
        maxSize,
        afterRead,
      } = this
      const oversize = Array.isArray(file)
        ? file.some(item => item.size > maxSize)
        : file.size > maxSize
      if (oversize) {
        this.$emit('oversize', Object.assign({
          file,
        }, this.getDetail()))
        return
      }
      if (typeof afterRead === 'function')
        afterRead(file, this.getDetail())

      this.$emit('afterRead', Object.assign({
        file,
      }, this.getDetail()))
    },
    deleteItem(index) {
      this.$emit(
        'delete',
        Object.assign(Object.assign({}, this.getDetail(index)), {
          file: this.fileList[index],
        }),
      )
    },
    // 预览图片
    onPreviewImage(item, index) {
      const lists = this.$uv.deepClone(this.lists)
      lists.map((i, j) => {
        if (j == index)
          i.current = true
      })
      const filters = lists.filter(i => i.isImage)
      const findIndex = filters.findIndex(i => i.current)
      this.onClickPreview(item, index)
      if (!item.isImage || !this.previewFullImage)
        return
      uni.previewImage({
        // 先filter找出为图片的item，再返回filter结果中的图片url
        urls: this.lists.filter(item => this.accept === 'image' || image(item.url || item.thumb)).map(item => item.url || item.thumb),
        current: findIndex,
        fail() {
          this.$uv.toast('预览图片失败')
        },
      })
    },
    onPreviewVideo(item, index) {
      this.onClickPreview(item, index)
      if (!this.previewFullVideo || !item.isVideo)
        return
      this.$refs.previewVideo.open(item.url)
    },
    onClickPreview(item, index) {
      this.$emit(
        'clickPreview',
        Object.assign(Object.assign({}, item), this.getDetail(index)),
      )
    },
  },
}
</script>

<template>
  <view class="uv-upload" :style="[$uv.addStyle(customStyle)]">
    <view class="uv-upload__wrap">
      <template v-if="previewImage">
        <view v-for="(item, index) in lists" :key="index" class="uv-upload__wrap__preview">
          <image
            v-if="item.isImage || (item.type && item.type === 'image')"
            :src="item.thumb || item.url" :mode="imageMode"
            class="uv-upload__wrap__preview__image"
            :style="[{
              width: $uv.addUnit(width),
              height: $uv.addUnit(height),
            }]"
            @tap="onPreviewImage(item, index)"
          />
          <view
            v-else
            class="uv-upload__wrap__preview__other"
            :style="[{
              width: $uv.addUnit(width),
              height: $uv.addUnit(height),
            }]"
            @tap="onPreviewVideo(item, index)"
          >
            <uv-icon color="#80CBF9" size="26" :name="item.isVideo || (item.type && item.type === 'video') ? 'movie' : 'folder'" />
            <text class="uv-upload__wrap__preview__other__text">
              {{ item.isVideo || (item.type && item.type === 'video') ? '视频' : '文件' }}
            </text>
          </view>
          <view v-if="item.status === 'uploading' || item.status === 'failed'" class="uv-upload__status">
            <view class="uv-upload__status__icon">
              <uv-icon v-if="item.status === 'failed'" name="close-circle" color="#ffffff" size="25" />
              <uv-loading-icon v-else size="22" mode="circle" />
            </view>
            <text v-if="item.message" class="uv-upload__status__message">
              {{ item.message }}
            </text>
          </view>
          <view v-if="item.status !== 'uploading' && (deletable || item.deletable)" class="uv-upload__deletable" @tap.stop="deleteItem(index)">
            <view class="uv-upload__deletable__icon">
              <uv-icon name="close" color="#ffffff" size="10" />
            </view>
          </view>
          <view v-if="item.status === 'success'" class="uv-upload__success">
            <!-- #ifdef APP-NVUE -->
            <image :src="successIcon" class="uv-upload__success__icon" />
            <!-- #endif -->
            <!-- #ifndef APP-NVUE -->
            <view class="uv-upload__success__icon">
              <uv-icon name="checkmark" color="#ffffff" size="12" />
            </view>
            <!-- #endif -->
          </view>
        </view>
      </template>
      <template v-if="isInCount">
        <view @tap="chooseFile">
          <slot>
            <view
              class="uv-upload__button" :hover-class="!disabled ? 'uv-upload__button--hover' : ''" hover-stay-time="150" :class="[disabled && 'uv-upload__button--disabled']" :style="[{
                width: $uv.addUnit(width),
                height: $uv.addUnit(height),
              }]" @tap.stop="chooseFile"
            >
              <uv-icon :name="uploadIcon" size="26" :color="uploadIconColor" />
              <text v-if="uploadText" class="uv-upload__button__text">
                {{ uploadText }}
              </text>
            </view>
          </slot>
        </view>
      </template>
    </view>
    <uv-preview-video ref="previewVideo" />
  </view>
</template>

<style lang="scss" scoped>
 @import '@/uni_modules/uv-ui-tools/libs/css/components.scss';
 @import '@/uni_modules/uv-ui-tools/libs/css/color.scss';
 $uv-upload-preview-border-radius: 2px !default;
 $uv-upload-preview-margin: 0 8px 8px 0 !default;
 $uv-upload-image-width: 80px !default;
 $uv-upload-image-height: $uv-upload-image-width;
 $uv-upload-other-bgColor: rgb(242, 242, 242) !default;
 $uv-upload-other-flex: 1 !default;
 $uv-upload-text-font-size: 11px !default;
 $uv-upload-text-color: $uv-tips-color !default;
 $uv-upload-text-margin-top: 2px !default;
 $uv-upload-deletable-right: 0 !default;
 $uv-upload-deletable-top: 0 !default;
 $uv-upload-deletable-bgColor: rgb(55, 55, 55) !default;
 $uv-upload-deletable-height: 14px !default;
 $uv-upload-deletable-width: $uv-upload-deletable-height;
 $uv-upload-deletable-boder-bottom-left-radius: 100px !default;
 $uv-upload-deletable-zIndex: 3 !default;
 $uv-upload-success-bottom: 0 !default;
 $uv-upload-success-right: 0 !default;
 $uv-upload-success-border-style: solid !default;
 $uv-upload-success-border-top-color: transparent !default;
 $uv-upload-success-border-left-color: transparent !default;
 $uv-upload-success-border-bottom-color: $uv-success !default;
 $uv-upload-success-border-right-color: $uv-upload-success-border-bottom-color;
 $uv-upload-success-border-width: 9px !default;
 $uv-upload-icon-top: 0px !default;
 $uv-upload-icon-right: 0px !default;
 $uv-upload-icon-h5-top: 1px !default;
 $uv-upload-icon-h5-right: 0 !default;
 $uv-upload-icon-width: 16px !default;
 $uv-upload-icon-height: $uv-upload-icon-width;
 $uv-upload-success-icon-bottom: -10px !default;
 $uv-upload-success-icon-right: -10px !default;
 $uv-upload-status-right: 0 !default;
 $uv-upload-status-left: 0 !default;
 $uv-upload-status-bottom: 0 !default;
 $uv-upload-status-top: 0 !default;
 $uv-upload-status-bgColor: rgba(0, 0, 0, 0.5) !default;
 $uv-upload-status-icon-Zindex: 1 !default;
 $uv-upload-message-font-size: 12px !default;
 $uv-upload-message-color: #FFFFFF !default;
 $uv-upload-message-margin-top: 5px !default;
 $uv-upload-button-width: 80px !default;
 $uv-upload-button-height: $uv-upload-button-width;
 $uv-upload-button-bgColor: rgb(244, 245, 247) !default;
 $uv-upload-button-border-radius: 2px !default;
 $uv-upload-botton-margin: 0 8px 8px 0 !default;
 $uv-upload-text-font-size: 11px !default;
 $uv-upload-text-color: $uv-tips-color !default;
 $uv-upload-text-margin-top: 2px !default;
 $uv-upload-hover-bgColor: rgb(230, 231, 233) !default;
 $uv-upload-disabled-opacity: .5 !default;
 .uv-upload {
  @include flex(column);
  flex: 1;
  &__wrap {
   @include flex;
   flex-wrap: wrap;
   flex: 1;
   &__preview {
    border-radius: $uv-upload-preview-border-radius;
    margin: $uv-upload-preview-margin;
    position: relative;
    overflow: hidden;
    @include flex;
    &__image {
     width: $uv-upload-image-width;
     height: $uv-upload-image-height;
    }
    &__other {
     width: $uv-upload-image-width;
     height: $uv-upload-image-height;
     background-color: $uv-upload-other-bgColor;
     flex: $uv-upload-other-flex;
     @include flex(column);
     justify-content: center;
     align-items: center;
     &__text {
      font-size: $uv-upload-text-font-size;
      color: $uv-upload-text-color;
      margin-top: $uv-upload-text-margin-top;
     }
    }
   }
  }
  &__deletable {
   position: absolute;
   top: $uv-upload-deletable-top;
   right: $uv-upload-deletable-right;
   background-color: $uv-upload-deletable-bgColor;
   height: $uv-upload-deletable-height;
   width: $uv-upload-deletable-width;
   @include flex;
   border-bottom-left-radius: $uv-upload-deletable-boder-bottom-left-radius;
   align-items: center;
   justify-content: center;
   z-index: $uv-upload-deletable-zIndex;
   &__icon {
    position: absolute;
    transform: scale(0.7);
    top: $uv-upload-icon-top;
    right: $uv-upload-icon-right;
    /* #ifdef H5 */
    top: $uv-upload-icon-h5-top;
    right: $uv-upload-icon-h5-right;
    /* #endif */
   }
  }
  &__success {
   position: absolute;
   bottom: $uv-upload-success-bottom;
   right: $uv-upload-success-right;
   @include flex;
   // 由于weex(nvue)为阿里巴巴的KPI(部门业绩考核)的laji产物，不支持css绘制三角形
   // 所以在nvue下使用图片，非nvue下使用css实现
   /* #ifndef APP-NVUE */
   border-style: $uv-upload-success-border-style;
   border-top-color: $uv-upload-success-border-top-color;
   border-left-color: $uv-upload-success-border-left-color;
   border-bottom-color: $uv-upload-success-border-bottom-color;
   border-right-color: $uv-upload-success-border-right-color;
   border-width: $uv-upload-success-border-width;
   align-items: center;
   justify-content: center;
   /* #endif */
   &__icon {
    /* #ifndef APP-NVUE */
    position: absolute;
    transform: scale(0.7);
    bottom: $uv-upload-success-icon-bottom;
    right: $uv-upload-success-icon-right;
    /* #endif */
    /* #ifdef APP-NVUE */
    width: $uv-upload-icon-width;
    height: $uv-upload-icon-height;
    /* #endif */
   }
  }
  &__status {
   position: absolute;
   top: $uv-upload-status-top;
   bottom: $uv-upload-status-bottom;
   left: $uv-upload-status-left;
   right: $uv-upload-status-right;
   background-color: $uv-upload-status-bgColor;
   @include flex(column);
   align-items: center;
   justify-content: center;
   &__icon {
    position: relative;
    z-index: $uv-upload-status-icon-Zindex;
   }
   &__message {
    font-size: $uv-upload-message-font-size;
    color: $uv-upload-message-color;
    margin-top: $uv-upload-message-margin-top;
   }
  }
  &__button {
   @include flex(column);
   align-items: center;
   justify-content: center;
   width: $uv-upload-button-width;
   height: $uv-upload-button-height;
   background-color: $uv-upload-button-bgColor;
   border-radius: $uv-upload-button-border-radius;
   margin: $uv-upload-botton-margin;
   /* #ifndef APP-NVUE */
   box-sizing: border-box;
   /* #endif */
   &__text {
    font-size: $uv-upload-text-font-size;
    color: $uv-upload-text-color;
    margin-top: $uv-upload-text-margin-top;
   }
   &--hover {
    background-color: $uv-upload-hover-bgColor;
   }
   &--disabled {
    opacity: $uv-upload-disabled-opacity;
   }
  }
 }
</style>
